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@MattMears
I always chase the thread after a frame has been powder coated. In regard to facing the shell, this is only necessary if you are running an external bottom bracket. If your frame is steel, and you face the shell and run it with a non-external bottom bracket, it will leave and exposed area where rust can start forming, which could potentially be problematic with powder coating as rust grows under the surface. I always touch up any chips in my frame with nail polish! A good phosphate primer will also help prevent rust spreading.